The article states that they spotted "activity". How do we know it is nuclear? Is everything that goes on at Handford reservation in Washington State "nuclear" in nature? Why should we even be concerned about this? This from a country who was going to prove that they had a rocket that could make it to the U.S. but barely made it off the launch pad. I would be more concerned that their test would end in a meltdown let alone be a success.
Just what exactly are you waiting for to show concern? A million dead?